<?php
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * Easy set variables
	 */
	
	/* Array of database columns which should be read and sent back to DataTables. Use a space where
	 * you want to insert a non-database field (for example a counter or static image)
	 */
	$aColumns = array( 'engine', 'browser', 'platform', 'version', 'grade' );
	
	/* Indexed column (used for fast and accurate table cardinality) */
	$sIndexColumn = "id";
	
	/* DB table to use */
	$sTable = "ajax";
	
	/* Database connection information */
	$gaSql['user']       = "";
	$gaSql['password']   = "";
	$gaSql['db']         = "";
	$gaSql['server']     = "localhost";
	
	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
	 * If you just want to use the basic configuration for DataTables with PHP server-side, there is
	 * no need to edit below this line
	 */
	
	/* 
	 * MySQL connection
	 */
	$gaSql['link'] =  mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password']  ) or
		die( 'Could not open connection to server' );
	
	mysql_select_db( $gaSql['db'], $gaSql['link'] ) or 
		die( 'Could not select database '. $gaSql['db'] );
	
	
	/* 
	 * Paging
	 */
	$sLimit = "";
	if ( isset( $_GET['iDisplayStart'] ) && $_GET['iDisplayLength'] != '-1' )
	{
		$sLimit = "LIMIT ".mysql_real_escape_string( $_GET['iDisplayStart'] ).", ".
			mysql_real_escape_string( $_GET['iDisplayLength'] );
	}
	
	
	/*
	 * Ordering
	 */
	$sOrder = "";
	if ( isset( $_GET['iSortCol_0'] ) )
	{
		$sOrder = "ORDER BY  ";
		for ( $i=0 ; $i<intval( $_GET['iSortingCols'] ) ; $i++ )
		{
			if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
			{
				$sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] )-1 ]."
				 	".mysql_real_escape_string( $_GET['sSortDir_'.$i] ) .", ";
			}
		}
		
		$sOrder = substr_replace( $sOrder, "", -2 );
		if ( $sOrder == "ORDER BY" )
		{
			$sOrder = "";
		}
	}
	
	
	/*
	* Filtering
	* NOTE this does not match the built-in DataTables filtering which does it
	* word by word on any field. It's possible to do here, but concerned about efficiency
	* on very large tables, and MySQL's regex functionality is very limited
	*/
	$sWhere = "";
	if ( $_GET['sSearch'] != "" )
	{
		$sWhere = "(";
		$aWords = preg_split('/\s+/', $_GET['sSearch']);
		for ( $j=0 ; $j<count($aWords) ; $j++ )
		{
			if ( $aWords[$j] != "" )
			{
				$sWhere .= "(";
				for ( $i=0 ; $i<count($aColumns) ; $i++ )
				{
					$sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $aWords[$j] )."%' OR ";
				}
				$sWhere = substr_replace( $sWhere, "", -3 );
				$sWhere .= ") AND ";
			}
		}
		 
		$sWhere = substr_replace( $sWhere, "", -5 );
		$sWhere .= ")";
	}
	 
	/* Individual column filtering */
	$sColumnWhere = "";
	for ( $i=0 ; $i<count($aColumns) ; $i++ )
	{  
		if ( $_GET['sSearch_'.$i] != "" )
		{
			$aWords = preg_split('/\s+/', $_GET['sSearch_'.$i]);
			$sColumnWhere .= "(";
			for ( $j=0 ; $j<count($aWords) ; $j++ )
			{
				if ( $aWords[$j] != "" )
				{
					$sColumnWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $aWords[$j] )."%' OR ";
				}
			}
			$sColumnWhere = substr_replace( $sColumnWhere, "", -3 );
			$sColumnWhere .= ") AND ";
		}
	}
	 
	if ( $sColumnWhere != "" ) {
		$sColumnWhere = substr_replace( $sColumnWhere, "", -5 );
		if ( $sWhere == "" ) {
			$sWhere = $sColumnWhere;
		} else {
			$sWhere .= " AND ".$sColumnWhere;
		}
	}
	 
	if ( $sWhere != "" )
	{
		$sWhere = "WHERE ".$sWhere;
	}
	
	
	/*
	 * SQL queries
	 * Get data to display
	 */
	$sQuery = "
		SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
		FROM   $sTable
		$sWhere
		$sOrder
		$sLimit
	";
	$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
	
	/* Data set length after filtering */
	$sQuery = "
		SELECT FOUND_ROWS()
	";
	$rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
	$aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
	$iFilteredTotal = $aResultFilterTotal[0];
	
	/* Total data set length */
	$sQuery = "
		SELECT COUNT(".$sIndexColumn.")
		FROM   $sTable
	";
	$rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());
	$aResultTotal = mysql_fetch_array($rResultTotal);
	$iTotal = $aResultTotal[0];
	
	
	/*
	 * Output
	 */
	$output = array(
		"sEcho" => intval($_GET['sEcho']),
		"iTotalRecords" => $iTotal,
		"iTotalDisplayRecords" => $iFilteredTotal,
		"aaData" => array()
	);
	
	while ( $aRow = mysql_fetch_array( $rResult ) )
	{
		$row = array();

		/* Add the  details image at the start of the display array */
		$row[] = '<img src="img/details_open.png">';

		for ( $i=0 ; $i<count($aColumns) ; $i++ )
		{
			if ( $aColumns[$i] == "version" )
			{
				/* Special output formatting for 'version' column */
				$row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
			}
			else if ( $aColumns[$i] != ' ' )
			{
				/* General output */
				$row[] = $aRow[ $aColumns[$i] ];
			}
		}
		$row['extra'] = 'hrmll';
		$output['aaData'][] = $row;
	}
	
	echo json_encode( $output );
?>